<template>
  <div>
    <!-- 面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <!-- 提示区域-->
      <el-alert
          title="添加商品信息"
          type="info"
          center
          show-icon
          :closable="false">
      </el-alert>

        <!-- 步骤条区域-->
        <el-steps :space="200" :active="activeIndex - 0" align-center finish-status="success">
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">

          <!-- tab栏区域-->
          <el-tabs v-model="activeIndex" tab-position="left"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked">
              <el-tab-pane label="基本信息" name="0">

                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                        v-model="addForm.goods_cat"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-form-item>

              </el-tab-pane>

              <el-tab-pane label="商品参数" name="1">
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                  <el-checkbox-group v-model="item.attr_vals">
                      <el-checkbox border v-for="(cb, i) in item.attr_vals" :key="i" :label="cb"></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
              </el-tab-pane>

              <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                  <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
              </el-tab-pane>

              <el-tab-pane label="商品图片" name="3">
                <el-upload
                  :action="uploadURL"
                  :on-preview="handlePreview"
                  :on-remove="handleRemove"
                  list-type="picture"
                  :headers="headerObj"
                  :on-success="handleSuccsee">
                  <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
              </el-tab-pane>

              <el-tab-pane label="商品内容" name="4">
                <quill-editor v-model="addForm.goods_introduce" />

                <el-button type="primary" style="margin-top: 20px;" @click="add">添加商品</el-button>
              </el-tab-pane>
          </el-tabs>

        </el-form>

        <!-- 图片预览-->
        <el-dialog
          title="图片预览"
          :visible.sync="previewVisible"
          width="50%">

          <img :src="previewPath" alt="图片预览" class="previewImg">

        </el-dialog>
    </el-card>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data () {
    return {
      cateList: [],
      manyTableData: [],
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      /* 设置图片上传的请求头 */
      headerObj: { Authorization: window.sessionStorage.getItem('token') },
      /* 预览的图片路径 */
      previewPath: '',
      previewVisible: false,

      /* 当前所在标签的name */
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 9.9,
        goods_weight: 1,
        goods_number: 1,
        goods_cat: [],
        /* 图片的数组 */
        pisc: [],
        goods_introduce: '',
        attrs: []
      },
      /* 表单验证规则 */
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },

      /* 级联选择器 */
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    /* 获取所有商品分类数据 */
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.cateList = res.data
    },
    /* 级联选择器选项改变触发 */
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
    },
    /* tab标签切换时触发，返回false表示不切换 */
    beforeTabLeave (activeName, oldName) {
      if (oldName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    /* 点击标签时触发 */
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数失败！')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数失败！')
        this.onlyTableData = res.data
      }
    },
    /* 处理图片预览效果 */
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    /* 处理移除图片的操作 */
    handleRemove (file) {
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pisc.findIndex(x => x.pic === filePath)
      this.addForm.pisc.splice(i, 1)
    },
    /* 监听图片上传成功的事件 */
    handleSuccsee (res) {
      const picInfo = { pic: res.data.tmp_path }
      this.addForm.pisc.push(picInfo)
    },
    /* 添加商品 */
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项！')
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败！提示：' + res.meta.msg)
        this.$message.success('添加商品成功了')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) return this.addForm.goods_cat[2]
      return null
    }
  }
}
</script>

<style lang="less" scoped>
  .el-steps {
    margin: 20px 0;
  }
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }
  .previewImg {
    width: 100%;
  }
</style>
